The huge desert voids.The emptiness of outer space.Without their support he'll be ruling in a vacuum.

source: WordNet 3.0

a region that is devoid of matter

source: WordNet 3.0

an electrical home appliance that cleans by suction

source: WordNet 3.0

A space entirely devoid of matter (called also, by way of distinction, absolute vacuum); hence, in a more general sense, a space, as the interior of a closed vessel, which has been exhausted to a high or the highest degree by an air pump or other artificial means; as, water boils at a reduced temperature in a vacuum.